Annabeth is a Valkyrie, hand chosen by Odin to serve as a guardian to the nine realms. She has proven herself more than capable of baring the burden of such immense power and responsibility via her countless victorious battles, her strong convictions and her charismatic charm. But Loki breaks out of his cell during a Jotun raid, banishing Anna to Midgard as a new enemy appears.

Alexstrasza is a dragon aspect, an immortal being with immense magical power. She is confronted with her brother's rebellion laced with malice, who has set his sights on Earth, Alexstrasza's most prized creation. She swore an oath to protect all living things with her dying breath. But what will she do when she must take life in order to give life in return?